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What version of Cura are you using? Mac? Windows? I'm using Cura 14.03 on Windows and saving files as .stl works fine for me. Click save file... and then enter the file name INCLUDING the correct file ending (e.g. myfile.stl). If you just enter the file name without an ending specified, Cura will save it as .amf.

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if you overwrite the extension .amf with .stl ist saves a valid STL-File

Hi Berndjm,

Thanks for the tip. I just tested renaming a Cura-exported AMF to STL and importing it into Simplify3D to test compatibility. Simplify3D imports .stl and .obj files. Loading a renamed AMF file crashed the program and didn't open any model. I guess the difference between the formats is too big.

I see why Ultimaker may want to change away from STL to AMF. The Additive Manufacturing Files are not based on a single company (3D Systems) but instead determined by a group of makers. It is an open standard and has native support for colors and materials unlike STL. Several other technical reasons have been discussed on 3Daddfab.

Nevertheless, STL is much more established. Nearly every 3D modeling software can read the format. As tested here, this is not the case for AMF. I'd much prefer an STL export option on the already buggy Cura port for OS X (15.04.3).

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Renaming the file to .stl after you've exported it as .amf cannot work!

You should overwrite the given .amf extension in the save(as) dialog to save it as .stl

My bad. This trick is so counterintuitive that I didn't get it at first. It's weird that you can actually change the file format just by changing the file name. Thanks for clearing that up. It worked now.[/media]

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